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Swallow - Wikipedia, the Free Encyclopedia
The swallows and martins are a group of passerine birds in the family Hirundinidae that are characterised by their adaptation to aerial feeding. Swallow is used colloquially in Europe as a synonym for the barn swallow.
https://en.wikipedia.org/wiki/Swallow
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Purple Martin - Wikipedia, the Free Encyclopedia
The purple martin (Progne subis) is the largest North American swallow. These aerial acrobats have speed and agility in flight, and when approaching their housing, will dive from the sky at great speeds with their wings tucked.
https://en.wikipedia.org/wiki/Purple_martin
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10,000 Birds - What is a Swallow?
If birders say they love birds ostensibly because they can fly and we cannot, then there must be no more beloved group of birds than the swallows.
http://10000birds.com/i-and-the-bird-what-is-a-swallow.htm
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The RSPB: Swallow
Look for swallows dashing low over water and fields in search of insects. In late summer and autumn, they can be seen congregating on telegraph wires in large numbers.
https://www.rspb.org.uk/discoverandenjoynature/discoverandlearn/birdguide/name/s/swallow/
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Barn Swallow - Hirundo rustica - ARKive
Learn more about the Barn swallow - with amazing Barn swallow videos, photos and facts on ARKive
http://www.arkive.org/barn-swallow/hirundo-rustica/
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Barn Swallows - National Geographic
Learn all you wanted to know about barn swallows with facts, pictures, videos, and news from National Geographic.
http://animals.nationalgeographic.com/animals/birding/barn-swallow
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Tree Swallow - Audubon Field Guide
The popularity of the bluebird has been a boon to the Tree Swallow, which nests in holes of exactly the same size, and has taken advantage of bluebird houses over much of North America. In regions with no such ready supply of artificial nest sites, the swallows must compete with other cavity-nesting birds, arriving early in spring to stake out territories.
https://www.audubon.org/field-guide/bird/tree-swallow
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Barn Swallow - Audubon Field Guide
One of our most familiar birds in rural areas and semi-open country, this swallow is often seen skimming low over fields with a flowing, graceful flight.
https://www.audubon.org/field-guide/bird/barn-swallow
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Tree Swallow, Identification - All About Birds
Learn how to identify Tree Swallow, its life history, cool facts, sounds and calls, and watch videos. Handsome aerialists with deep-blue iridescent backs and clean white fronts, Tree Swallows are a familiar sight in summer fields and wetlands across northern North America.
https://www.allaboutbirds.org/guide/tree_swallow/id
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Make a Purple Martin Gourd Birdhouse - Birds and Blooms
Homemade birdhouses fashioned from gourds have been used for centuries to attract purple martins. Learn to make your own purple martin gourd birdhouse.
http://www.birdsandblooms.com/backyard-projects/diy-birdhouse/make-purple-martin-gourd-birdhouse/
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How to Attract Purple Martins - About
Tips for attracting purple martins to your backyard by meeting the birds' needs for food, water, shelter and nesting sites in safe and easy ways.
http://birding.about.com/od/attractingbirds/a/attractpurplemartins.htm
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Purple Martins - National Geographic
Learn all you wanted to know about purple martins with facts, pictures, videos, and news from National Geographic.
http://animals.nationalgeographic.com/animals/birding/purple-martin
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Purple Martin - Audubon Field Guide
Graceful in flight, musical in its pre-dawn singing, this big swallow is one of our most popular birds. Almost all Purple Martins in the east now nest in birdhouses put up especially for them. Martin housing has a long history: some Native American tribes reportedly hung up hollow gourds around their villages to attract these birds.
https://www.audubon.org/field-guide/bird/purple-martin
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Purple Martin, Identification - All About Birds
Learn how to identify Purple Martin, its life history, cool facts, sounds and calls, and watch videos. Putting up a Purple Martin house is like installing a miniature neighborhood in your backyard. In the East, dark, glossy-blue males and brown females will peer from the entrances and chirp from the rooftops all summer. In the West, martins mainly still nest the old-fashioned way-in woodpecker holes.
https://www.allaboutbirds.org/guide/Purple_Martin/id